chore: make ActivityBaggageLogScopeWrapper implements IEnumerable<KeyValuePair<string, object?>>

Author: NatMarchand

src/Libraries/Microsoft.Extensions.Telemetry/Logging/Import/LoggerFactoryScopeProvider.cs

@@ -236,7 +236,7 @@ IEnumerator IEnumerable.GetEnumerator()
             }
         }
 
-        private sealed class ActivityBaggageLogScopeWrapper : IEnumerable<KeyValuePair<string, string?>>
+        private sealed class ActivityBaggageLogScopeWrapper : IEnumerable<KeyValuePair<string, string?>>, IEnumerable<KeyValuePair<string, object?>>
         {
             private readonly IEnumerable<KeyValuePair<string, string?>> _items;
 
@@ -252,6 +252,11 @@ public ActivityBaggageLogScopeWrapper(IEnumerable<KeyValuePair<string, string?>>
                 return _items.GetEnumerator();
             }
 
+            IEnumerator<KeyValuePair<string, object>> IEnumerable<KeyValuePair<string, object>>.GetEnumerator()
+            {
+                return _items.Select(x => KeyValuePair.Create<string, object?>(x.Key, x.Value)).GetEnumerator();
+            }
+
             IEnumerator IEnumerable.GetEnumerator()
             {
                 return _items.GetEnumerator();